The beta runs from November 9, right up until the game's release on November 17. If you pre-order the special edition in this period, you still get beta access.

Planet Coaster's beta includes all the game's content other than campaign scenarios, which are being held back for launch. This means you can still enter sandbox mode and build and maintain the park of your dreams, maybe even taking part in some community creation.

Here's a short video showing off all that creating and sharing in action: